CN104818426A - High-strength microalloyed rare-earth cast steel and preparation method thereof - Google Patents
High-strength microalloyed rare-earth cast steel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-strength microalloyed rare-earth cast steel which mainly comprises the following chemical components in percentage by mass: 0.30%-0.40% of C, 0.60%-0.80% of Si, 1.10%-1.40% of Mn, 0.03%-0.09% of Nb, 0.01%-0.08% of Ti, 0.01%-0.20% of Re, 0.01%-0.10% of La, 0.01%-0.15% of Ce, at most 0.035% of P, at most 0.010% of S, and the balance of iron and trace impurity elements. The microalloyed rare-earth cast steel can obviously enhance the yield strength and tensile strength on the premise of not obviously lowering the plasticity and toughness.
Description
Technical field
The present invention relates to a kind of cast steel material, the large-scale pressure part high-strength micro-alloy rare earth cast steel in the equipment such as especially a kind of applicable mine, cement, coal, oil, and smelt, heat-treatment technology method.
Background technology
It is relatively easy that large-scale steel-casting has shaping, the features such as production cost is lower, thus mine is widely used in, cement, oil, the fields such as boats and ships, but easily there is shrinkage porosite in large-scale steel-casting in forming process, shrinkage cavity, the defect such as pore and crackle, thus affect mechanical property and the work-ing life of large-scale steel-casting, larger loss is caused to enterprise and national economy, in addition, because steel-making of intermediate frequency furnace cost is lower, China still has many enterprises to use steel-making of intermediate frequency furnace now, steelmaking process generally adopts non-oxidizing process, dephosphorization and desulfurization can not be carried out to molten steel, so the steel quality smelted out is poor, this causes large-scale steel-casting to be more prone to occur tissue defects in cast form process, as casting crack and pore, thus its mechanical property and work-ing life are reduced further.
In addition, silicon, manganese have very rich in natural resources in China, and manganese steel, silicon manganese steel have higher intensity, hardness and wear resistance, and therefore manganese steel, silicon manganese steel are a kind of materials conventional in large-scale steel-casting.Smelt manganese steel, silicon manganese steel often using ferrosilicon, ferromanganese as alloying element, and phosphorus element content is more in ferrosilicon, ferromanganese, and can not to liquid steel dephosphorization desulfurization when adopting steel-making of intermediate frequency furnace, thus make the content of phosphoric in manganese steel, silicon manganese steel higher, even exceed national standard, finally make manganese steel, the performance of silicon manganese steel is not in full use.
Chinese patent literature CN 100999800 A(application number 200610155704.1) disclose a kind of cast steel containing rare earth element and production method thereof, its chemical composition and mass percentage are: C 0.24% ~ 0.32%, Si 1.0% ~ 1.6%, Mn 1.0% ~ 1.6%, Cr 0.2% ~ 0.5%, Re 0.01% ~ 0.20%, Ni≤0.05%, Mo≤0.01%, P≤0.035%, S≤0.010%, B≤0.05%, surplus is iron and inevitable impurity.In this cast steel, the content of Si element is higher, easily causes the plasticity of steel casting, toughness and cutting ability to reduce.Simultaneously to add the total content of S higher for P, thus reduce plasticity and the toughness of steel casting further.
Therefore, be just badly in need of developing a kind of high-strength micro-alloy rare earth cast steel that can reduce P and S constituent content and preparation method thereof, through retrieval, do not find the same or analogous technical scheme with the present invention.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-strength micro-alloy rare earth cast steel that can reduce P and S constituent content and preparation method thereof.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of high-strength micro-alloy rare earth cast steel, its innovative point is: the main chemical compositions of described cast steel comprises C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, iron and micro impurity element, described C, Si, Mn, Nb, Ti, Re, P, the mass percentage of S is respectively C 0.30% ~ 0.40%, Si 0.60% ~ 0.80%, Mn 1.10% ~ 1.40%, Nb 0.03% ~ 0.09%, Ti 0.01 ~ 0.08%, Re 0.01% ~ 0.20%, La0.01% ~ 0.10%, Ce0.01% ~ 0.15%, P≤0.035%, S≤0.010%.
Further, the total content of described Nb, Ti, La, Ce is less than or equal to 0.5%.
A smelting process for high-strength micro-alloy rare earth cast steel, adopts medium-frequency induction furnace to smelt, it is characterized in that smelting process comprises the following steps:
1) pre-treatment: before smelting, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and remove dirt and the iron rust on steel scrap surface.
2) prepare burden: the recovery rate of alloying element C, Si, Mn calculates according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel.
3) feed and feed in raw material: the large, medium and small metal charge of when filling with substance adds according to about 2:3:1, and furnace bottom put into by bulk metal furnace charge, and the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, ensureing in body of heater tight loose under furnace charge; Add furnace charge and adopt biscuit metal material.
4) add alloy: in stove steel scrap melting down after, first pre-add part ferromanganese, ferro-silicon, after the chemical composition of stokehold to be detected molten steel, then add final required ferromanganese, ferro-silicon according to detected result, and adopt and first add ferromanganese, then the order adding ferrosilicon adds; The alloying elements such as Nb, Ti, La, Ce add ladle bottom after drying in advance; In molten steel, carbon dust carburetting is poured into during tapping.
5) tap: tap adjust the chemical composition in molten steel according to step 4) after, tapping temperature controls, at 1650 DEG C ~ 1680 DEG C, to be sprinkled into appropriate slag former immediately after tapping on ladle liquid level.
6) final deoxygenation: carry out final deoxygenation with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, during molten steel impact ladle bottom, the fine aluminium oxygen melted also and in molten steel is reacted and carry out deoxidation, the add-on of fine aluminium is 0.050% ~ 0.125% of steel quality, and ensures that aluminium content residual in high-strength micro-alloy rare earth cast steel is 0.03% ~ 0.08%.
7) pour into a mould: by the pouring molten steel in step 6) ladle in preprepared mold, teeming temperature controls at 1550 DEG C ~ 1580 DEG C, what obtain after cooling, dismounting casting mold is high-strength micro-alloy rare earth cast steel part.
Further, ferromanganese, ferro-silicon and rare earth Nb, Ti, La, Ce etc. need the dry 2 ~ 5h of baking before addition, and baking drying temperature is 100 ~ 300 DEG C.
Further, the temperature range of pre-add ferromanganese, ferro-silicon controls at 1640 DEG C ~ 1660 DEG C, after the ladle chemistry of stokehold to be detected, then adds final required ferromanganese, ferro-silicon; The order adding alloy for twice is and first adds manganeseirom, treat manganeseirom all melting down, skim after, then add ferro-silicon.
Further, the microalloy element such as described Nb, Ti, La, Ce adds ladle bottom with the form of metal-powder.
A heat treating method for high-strength micro-alloy rare earth cast steel, is characterized in that: comprise normalizing treatment and temper two portions;
Described normalizing treatment technique is: in chamber type electric resistance furnace, be warming up to 860 DEG C ~ 960 DEG C with the speed of 80 DEG C/h ~ 120 DEG C/h, soaking time is steel casting thickness (mm) × 1.5 ~ 1.8min/h, then steel casting is cooled to room temperature in atmosphere;
Described tempering heat treatment process is: in chamber type electric resistance furnace, be warming up to 600 DEG C ~ 650 DEG C with the speed of 80 DEG C/h ~ 120 DEG C/h, soaking time is steel casting thickness (mm) × 1.8 ~ 2.2min/h, then steel casting is cooled to room temperature in atmosphere.The timed interval of normalizing and tempering is no more than 6h.
Further, after heat treatment, its tensile strength is more than or equal to 720MPa to described steel casting, yield strength is more than or equal to 430MPa, elongation is more than or equal to 10%, and relative reduction in area is more than or equal to 12%, and impact absorbing energy when impact test temperature is 5 DEG C is more than or equal to 11.5J.
The invention has the advantages that: (1) microalloying of the present invention rare earth cast steel under the condition of not obvious reduction plasticity and toughness, can significantly improve yield strength and tensile strength.Described microalloying rare earth cast steel is compared with common 35SiMn steel, and its yield strength can improve more than 60MPa, and tensile strength can improve more than 95MPa.
(2) microalloying rare earth cast steel of the present invention adopts conventional smelting technology, thermal treatment process, in addition in steel with the comparatively cheap alloying element such as silicon, manganese for starting material, and the microalloy element content such as Nb, Ti, La, Ce are less, while improving cast properties largely, can ensure that the manufacturing cost of foundry goods is lower, be conducive to industrial applications.
(3) the present invention is by improving the smelting technology of routine, effectively can reduce the content of P element in molten steel, be conducive to industrial applications and popularization.
(4) microalloying rare earth cast steel of the present invention is after 860 DEG C ~ 960 DEG C normalizing treatment+600 DEG C ~ 650 DEG C temper, mechanical property can be stable reach: tensile strength is more than or equal to 720MPa, yield strength is more than or equal to 430MPa, elongation is more than or equal to 10%, relative reduction in area is more than or equal to 12%, impact absorbing energy when impact test temperature is 5 DEG C is more than or equal to 11.5J, can be used for manufacturing the large-scale pressure-containing member in the fields such as cement, mine, coal, oil, as key components and partss such as large-scale tugboat, wheel belt and the gears in engineering machinery.
Accompanying drawing explanation
Fig. 1 is the impact of normalizing temperature on microalloying rare earth cast steel yield strength, tensile strength.
Fig. 2 is the impact of normalizing temperature on microalloying rare earth cast steel unit elongation, impelling strength.
Embodiment
Embodiment one
A kind of high-strength micro-alloy rare earth cast steel as shown in Figure 1, the main chemical compositions of cast steel comprises C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, iron and micro impurity element, the mass percentage of C, Si, Mn, Nb, Ti, Re, P, S is respectively C 0.30% ~ 0.40%, Si 0.60% ~ 0.80%, Mn 1.10% ~ 1.40%, Nb 0.03% ~ 0.09%, Ti 0.01 ~ 0.08%, Re 0.01% ~ 0.20%, La0.01% ~ 0.10%, Ce0.01% ~ 0.15%, P≤0.035%, S≤0.010%.
The total content of Nb, Ti, La, Ce of the present invention is less than or equal to 0.5%.
A smelting process for high-strength micro-alloy rare earth cast steel, adopt medium-frequency induction furnace to smelt, smelting process comprises the following steps:
1) pre-treatment: before smelting, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and remove dirt and the iron rust on steel scrap surface.
2) prepare burden: the recovery rate of alloying element C, Si, Mn calculates according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel.
3) feed and feed in raw material: the large, medium and small metal charge of when filling with substance adds according to about 2:3:1, and furnace bottom put into by bulk metal furnace charge, and the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, ensureing in body of heater tight loose under furnace charge; Add furnace charge and adopt biscuit metal material.
4) add alloy: in stove steel scrap melting down after, first pre-add part ferromanganese, ferro-silicon, after the chemical composition of stokehold to be detected molten steel, then add final required ferromanganese, ferro-silicon according to detected result, and adopt and first add ferromanganese, then the order adding ferrosilicon adds; The alloying elements such as Nb, Ti, La, Ce add ladle bottom after drying in advance; In molten steel, carbon dust carburetting is poured into during tapping.
5) tap: tap adjust the chemical composition in molten steel according to step 4) after, tapping temperature controls, at 1650 DEG C ~ 1680 DEG C, to be sprinkled into appropriate slag former immediately after tapping on ladle liquid level.
6) final deoxygenation: carry out final deoxygenation with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, during molten steel impact ladle bottom, the fine aluminium oxygen melted also and in molten steel is reacted and carry out deoxidation, the add-on of fine aluminium is 0.050% ~ 0.125% of steel quality, and ensures that aluminium content residual in high-strength micro-alloy rare earth cast steel is 0.03% ~ 0.08%.
7) pour into a mould: by the pouring molten steel in step 6) ladle in preprepared mold, teeming temperature controls at 1550 DEG C ~ 1580 DEG C, what obtain after cooling, dismounting casting mold is high-strength micro-alloy rare earth cast steel part.
Ferromanganese of the present invention, ferro-silicon and rare earth Nb, Ti, La, Ce etc. need the dry 2 ~ 5h of baking before addition, and baking drying temperature is 100 ~ 300 DEG C.
The temperature range of pre-add ferromanganese of the present invention, ferro-silicon controls at 1640 DEG C ~ 1660 DEG C, after the ladle chemistry of stokehold to be detected, then adds final required ferromanganese, ferro-silicon; The order adding alloy for twice is and first adds manganeseirom, treat manganeseirom all melting down, skim after, then add ferro-silicon.
The microalloy elements such as Nb, Ti, La, Ce of the present invention add ladle bottom with the form of metal-powder.
Embodiment two
A kind of high-strength micro-alloy rare earth cast steel as shown in Figure 1, the main chemical compositions of cast steel comprises C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, iron and micro impurity element, the mass percentage of C, Si, Mn, Nb, Ti, Re, P, S is respectively C 0.30% ~ 0.40%, Si 0.60% ~ 0.80%, Mn 1.10% ~ 1.40%, Nb 0.03% ~ 0.09%, Ti 0.01 ~ 0.08%, Re 0.01% ~ 0.20%, La0.01% ~ 0.10%, Ce0.01% ~ 0.15%, P≤0.035%, S≤0.010%.
The total content of Nb, Ti, La, Ce of the present invention is less than or equal to 0.5%.
A smelting process for high-strength micro-alloy rare earth cast steel, adopt medium-frequency induction furnace to smelt, smelting process comprises the following steps:
1) pre-treatment: before smelting, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and remove dirt and the iron rust on steel scrap surface.
2) prepare burden: the recovery rate of alloying element C, Si, Mn calculates according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel.
3) feed and feed in raw material: the large, medium and small metal charge of when filling with substance adds according to about 2:3:1, and furnace bottom put into by bulk metal furnace charge, and the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, ensureing in body of heater tight loose under furnace charge; Add furnace charge and adopt biscuit metal material.
4) add alloy: in stove steel scrap melting down after, first pre-add part ferromanganese, ferro-silicon, after the chemical composition of stokehold to be detected molten steel, then add final required ferromanganese, ferro-silicon according to detected result, and adopt and first add ferromanganese, then the order adding ferrosilicon adds; The alloying elements such as Nb, Ti, La, Ce add ladle bottom after drying in advance; In molten steel, carbon dust carburetting is poured into during tapping.
5) tap: tap adjust the chemical composition in molten steel according to step 4) after, tapping temperature controls, at 1650 DEG C ~ 1680 DEG C, to be sprinkled into appropriate slag former immediately after tapping on ladle liquid level.
6) final deoxygenation: carry out final deoxygenation with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, during molten steel impact ladle bottom, the fine aluminium oxygen melted also and in molten steel is reacted and carry out deoxidation, the add-on of fine aluminium is 0.050% ~ 0.125% of steel quality, and ensures that aluminium content residual in high-strength micro-alloy rare earth cast steel is 0.03% ~ 0.08%.
7) pour into a mould: by the pouring molten steel in step 6) ladle in preprepared mold, teeming temperature controls at 1550 DEG C ~ 1580 DEG C, what obtain after cooling, dismounting casting mold is high-strength micro-alloy rare earth cast steel part.
Ferromanganese of the present invention, ferro-silicon and rare earth Nb, Ti, La, Ce etc. need the dry 2 ~ 5h of baking before addition, and baking drying temperature is 100 ~ 300 DEG C.
The temperature range of pre-add ferromanganese of the present invention, ferro-silicon controls at 1640 DEG C ~ 1660 DEG C, after the ladle chemistry of stokehold to be detected, then adds final required ferromanganese, ferro-silicon; The order adding alloy for twice is and first adds manganeseirom, treat manganeseirom all melting down, skim after, then add ferro-silicon.
The microalloy elements such as Nb, Ti, La, Ce of the present invention add ladle bottom with the form of metal-powder.
A heat treating method for high-strength micro-alloy rare earth cast steel, comprises normalizing treatment and temper two portions;
Normalizing treatment technique of the present invention is: in chamber type electric resistance furnace, be warming up to 860 DEG C ~ 960 DEG C with the speed of 80 DEG C/h ~ 120 DEG C/h, soaking time is steel casting thickness (mm) × 1.5 ~ 1.8min/h, then steel casting is cooled to room temperature in atmosphere;
Tempering heat treatment process of the present invention is: in chamber type electric resistance furnace, be warming up to 600 DEG C ~ 650 DEG C with the speed of 80 DEG C/h ~ 120 DEG C/h, soaking time is steel casting thickness (mm) × 1.8 ~ 2.2min/h, then steel casting is cooled to room temperature in atmosphere.The timed interval of normalizing and tempering is no more than 6h.
After heat treatment, its tensile strength is more than or equal to 720MPa to steel casting of the present invention, and yield strength is more than or equal to 430MPa, and elongation is more than or equal to 10%, and relative reduction in area is more than or equal to 12%, and impact absorbing energy when impact test temperature is 5 DEG C is more than or equal to 11.5J.
Microalloying rare earth cast steel of the present invention under the condition of not obvious reduction plasticity and toughness, can significantly improve yield strength and tensile strength.Described microalloying rare earth cast steel is compared with common 35SiMn steel, and its yield strength can improve more than 60MPa, and tensile strength can improve more than 95MPa.
Microalloying rare earth cast steel of the present invention adopts conventional smelting technology, thermal treatment process, in addition in steel with the comparatively cheap alloying element such as silicon, manganese for starting material, and the microalloy element content such as Nb, Ti, La, Ce are less, while improving cast properties largely, can ensure that the manufacturing cost of foundry goods is lower, be conducive to industrial applications.
The present invention, by improving the smelting technology of routine, effectively can reduce the content of P element in molten steel, be conducive to industrial applications and popularization.
Microalloying rare earth cast steel of the present invention is after 860 DEG C ~ 960 DEG C normalizing treatment+600 DEG C ~ 650 DEG C temper, mechanical property can be stable reach: tensile strength is more than or equal to 720MPa, yield strength is more than or equal to 430MPa, elongation is more than or equal to 10%, relative reduction in area is more than or equal to 12%, impact absorbing energy when impact test temperature is 5 DEG C is more than or equal to 11.5J, can be used for manufacturing the large-scale pressure-containing member in the fields such as cement, mine, coal, oil, as key components and partss such as large-scale tugboat, wheel belt and the gears in engineering machinery.
The chemical composition of table 1 embodiment and comparative example and heat treatment process parameter
The mechanical property parameters of table 2 embodiment and comparative example
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. a high-strength micro-alloy rare earth cast steel, it is characterized in that: the main chemical compositions of described cast steel comprises C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, iron and micro impurity element, the mass percentage of described C, Si, Mn, Nb, Ti, Re, P, S is respectively C 0.30% ~ 0.40%, Si 0.60% ~ 0.80%, Mn 1.10% ~ 1.40%, Nb 0.03% ~ 0.09%, Ti 0.01 ~ 0.08%, Re 0.01% ~ 0.20%, La0.01% ~ 0.10%, Ce0.01% ~ 0.15%, P≤0.035%, S≤0.010%.
2. a kind of high-strength micro-alloy rare earth cast steel according to claim 1, is characterized in that: the total content of described Nb, Ti, La, Ce is less than or equal to 0.5%.
3. the smelting process of a kind of high-strength micro-alloy rare earth cast steel as claimed in claim 1, adopts medium-frequency induction furnace to smelt, it is characterized in that smelting process comprises the following steps:
1) pre-treatment: before smelting, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and remove dirt and the iron rust on steel scrap surface;
2) prepare burden: the recovery rate of alloying element C, Si, Mn calculates according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel;
3) feed and feed in raw material: the large, medium and small metal charge of when filling with substance adds according to about 2:3:1, and furnace bottom put into by bulk metal furnace charge, and the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, ensureing in body of heater tight loose under furnace charge; Add furnace charge and adopt biscuit metal material;
4) add alloy: in stove steel scrap melting down after, first pre-add part ferromanganese, ferro-silicon, after the chemical composition of stokehold to be detected molten steel, then add final required ferromanganese, ferro-silicon according to detected result, and adopt and first add ferromanganese, then the order adding ferrosilicon adds; The alloying elements such as Nb, Ti, La, Ce add ladle bottom after drying in advance; In molten steel, carbon dust carburetting is poured into during tapping;
5) tap: tap adjust the chemical composition in molten steel according to step 4) after, tapping temperature controls, at 1650 DEG C ~ 1680 DEG C, to be sprinkled into appropriate slag former immediately after tapping on ladle liquid level;
6) final deoxygenation: carry out final deoxygenation with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, during molten steel impact ladle bottom, the fine aluminium oxygen melted also and in molten steel is reacted and carry out deoxidation, the add-on of fine aluminium is 0.050% ~ 0.125% of steel quality, and ensures that aluminium content residual in high-strength micro-alloy rare earth cast steel is 0.03% ~ 0.08%;
7) pour into a mould: by the pouring molten steel in step 6) ladle in preprepared mold, teeming temperature controls at 1550 DEG C ~ 1580 DEG C, what obtain after cooling, dismounting casting mold is high-strength micro-alloy rare earth cast steel part.
4. the smelting process of a kind of high-strength micro-alloy rare earth cast steel according to claim 3, it is characterized in that: described ferromanganese, ferro-silicon and rare earth Nb, Ti, La, Ce etc. need the dry 2 ~ 5h of baking before addition, and baking drying temperature is 100 ~ 300 DEG C.
5. the smelting process of a kind of high-strength micro-alloy rare earth cast steel according to claim 3, it is characterized in that: the temperature range of described pre-add ferromanganese, ferro-silicon controls at 1640 DEG C ~ 1660 DEG C, after the ladle chemistry of stokehold to be detected, then add final required ferromanganese, ferro-silicon; The order adding alloy for twice is and first adds manganeseirom, treat manganeseirom all melting down, skim after, then add ferro-silicon.
6. the smelting process of a kind of high-strength micro-alloy rare earth cast steel according to claim 3, is characterized in that: the microalloy elements such as described Nb, Ti, La, Ce add ladle bottom with the form of metal-powder.
7. a heat treating method for a kind of high-strength micro-alloy rare earth cast steel as claimed in claim 1, is characterized in that: comprise normalizing treatment and temper two portions;
Described normalizing treatment technique is: in chamber type electric resistance furnace, be warming up to 860 DEG C ~ 960 DEG C with the speed of 80 DEG C/h ~ 120 DEG C/h, soaking time is steel casting thickness (mm) × 1.5 ~ 1.8min/h, then steel casting is cooled to room temperature in atmosphere;
Described tempering heat treatment process is: in chamber type electric resistance furnace, be warming up to 600 DEG C ~ 650 DEG C with the speed of 80 DEG C/h ~ 120 DEG C/h, soaking time is steel casting thickness (mm) × 1.8 ~ 2.2min/h, then steel casting is cooled to room temperature in atmosphere;
The timed interval of normalizing and tempering is no more than 6h.
8. the heat treating method of a kind of high-strength micro-alloy rare earth cast steel according to claim 7, it is characterized in that: described steel casting after heat treatment, its tensile strength is more than or equal to 720MPa, yield strength is more than or equal to 430MPa, elongation is more than or equal to 10%, relative reduction in area is more than or equal to 12%, and impact absorbing energy when impact test temperature is 5 DEG C is more than or equal to 11.5J.
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| CN105648345A (en) * | 2016-03-02 | 2016-06-08 | 上海市环境工程设计科学研究院有限公司 | High-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for incinerator fire grate and preparation method thereof |
| WO2018018389A1 (en) * | 2016-07-25 | 2018-02-01 | 顾湘 | High-strength microalloyed rare-earth cast steel |
| WO2019169549A1 (en) * | 2018-03-06 | 2019-09-12 | 高海艇 | Cast steel micro-alloyed with rare earth |
| WO2019169548A1 (en) * | 2018-03-06 | 2019-09-12 | 高海艇 | Low-strength cast steel micro-alloyed with rare earth |
| CN111334724A (en) * | 2020-03-12 | 2020-06-26 | 海安海太铸造有限公司 | Polymorphic high-degree deoxidation casting method for microalloyed rare earth cast steel |
| CN112159932A (en) * | 2020-09-29 | 2021-01-01 | 上海加宁新材料科技有限公司 | Method for manufacturing ultrahigh-strength rare earth 4340 steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600889A (en) * | 2004-10-26 | 2005-03-30 | 宁波浙东精密铸造有限公司 | Wearable cast steel in microalloy martensite and manufacturing method |
| JP2009299136A (en) * | 2008-06-13 | 2009-12-24 | Nippon Steel Corp | High strength steel sheet having excellent stretch flange formability and fatigue property, and method for refining the molten steel thereof |
| CN102230140A (en) * | 2010-04-28 | 2011-11-02 | 鞍钢集团矿业公司 | Novel martensitic wear resistant steel and production technology for steel casting thereof |
| CN103014540A (en) * | 2012-12-10 | 2013-04-03 | 张家港市鼎力铸钢有限公司 | Cast steel |
| CN103205634A (en) * | 2013-03-28 | 2013-07-17 | 宝山钢铁股份有限公司 | Low-alloy high-hardness wear-resistant steel plate and manufacturing method thereof |
-
2015
- 2015-05-19 CN CN201510255240.0A patent/CN104818426B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600889A (en) * | 2004-10-26 | 2005-03-30 | 宁波浙东精密铸造有限公司 | Wearable cast steel in microalloy martensite and manufacturing method |
| JP2009299136A (en) * | 2008-06-13 | 2009-12-24 | Nippon Steel Corp | High strength steel sheet having excellent stretch flange formability and fatigue property, and method for refining the molten steel thereof |
| CN102230140A (en) * | 2010-04-28 | 2011-11-02 | 鞍钢集团矿业公司 | Novel martensitic wear resistant steel and production technology for steel casting thereof |
| CN103014540A (en) * | 2012-12-10 | 2013-04-03 | 张家港市鼎力铸钢有限公司 | Cast steel |
| CN103205634A (en) * | 2013-03-28 | 2013-07-17 | 宝山钢铁股份有限公司 | Low-alloy high-hardness wear-resistant steel plate and manufacturing method thereof |
Cited By (6)
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|---|---|---|---|---|
| CN105648345A (en) * | 2016-03-02 | 2016-06-08 | 上海市环境工程设计科学研究院有限公司 | High-strength and high-toughness cast steel resistant to abrasion and corrosion in high temperature and used for incinerator fire grate and preparation method thereof |
| WO2018018389A1 (en) * | 2016-07-25 | 2018-02-01 | 顾湘 | High-strength microalloyed rare-earth cast steel |
| WO2019169549A1 (en) * | 2018-03-06 | 2019-09-12 | 高海艇 | Cast steel micro-alloyed with rare earth |
| WO2019169548A1 (en) * | 2018-03-06 | 2019-09-12 | 高海艇 | Low-strength cast steel micro-alloyed with rare earth |
| CN111334724A (en) * | 2020-03-12 | 2020-06-26 | 海安海太铸造有限公司 | Polymorphic high-degree deoxidation casting method for microalloyed rare earth cast steel |
| CN112159932A (en) * | 2020-09-29 | 2021-01-01 | 上海加宁新材料科技有限公司 | Method for manufacturing ultrahigh-strength rare earth 4340 steel |
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